I know he appears in "Close Encounters of the Frog Kind" and "Adventures in Muppet-Sitting". In "He's a Wonderful Frog" Kermit mentions he is going to visit Robin and shows a picture of him, but Robin himself doesn't actually appear.

Er, what is this "feature=relmfu"? Is it relevant to the discussion at hand?

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Sorry about that, Count. I'd love to clean it up if the edit button was on that post. I'm really not a huge fan of embedding youtube videos. Not exactly sure why posting a link automatically embeds the vid.